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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 29, 2019
Stock-Based Compensation [Abstract] |
Summary of Recognized Stock-based Compensation Expense | The following table summarizes stock-based compensation expense recognized:
|  | Fiscal quarters ended |  |  | Six fiscal months ended |
|  | June 29, 2019 |  |  | June 30, 2018 |  |  | June 29, 2019 |  |  | June 30, 2018 |
Restricted stock units |  | $ | 890 |  |  | $ | 778 |  |  | $ | 4,249 |  |  |  | 3,047 |
Phantom stock units |  |  | - |  |  |  | - |  |  |  | 177 |  |  |  | 214 |
Total |  | $ | 890 |  |  | $ | 778 |  |  | $ | 4,426 |  |  |  | 3,261 |
Summary of Unrecognized Compensation Cost and Weighted Average Remaining Amortization Periods | The following table summarizes unrecognized compensation cost and the weighted average remaining amortization periods at June 29, 2019 (amortization periods in years):
|  | Unrecognized Compensation Cost |  |  | Weighted Average Remaining Amortization Periods |
Restricted stock units |  | $ | 4,779 |  |  |  | 0.9 |
Phantom stock units |  |  | - |  |  |  | 0.0 |
Total |  | $ | 4,779 |  |  |  |  |
RSU Activity | RSU activity under the 2007 Program as of June 29, 2019 and changes during the six fiscal months then ended are presented below (number of RSUs in thousands):
|  | Number of RSUs |  |  | Weighted Average Grant-date Fair Value per Unit |
Outstanding: |  |  |  |  |  |
January 1, 2019 |  |  | 904 |  |  | $ | 14.77 |
Granted |  |  | 314 |  |  |  | 19.85 |
Vested* |  |  | (361 | ) |  |  | 11.70 |
Cancelled or forfeited |  |  | (15 | ) |  |  | 17.71 |
Outstanding at June 29, 2019 |  |  | 842 |  |  | $ | 17.93 |
Expected to vest at June 29, 2019 |  |  | 842 |  |  |  |  |
* The number of RSUs vested includes shares that the Company withheld on behalf of employees to satisfy the statutory tax withholding requirements.
RSUs with Performance-Based Vesting Criteria | The number of performance-based RSUs that are scheduled to vest increases ratably based on the achievement of defined performance criteria between the established target and maximum levels. RSUs with performance-based vesting criteria are expected to vest as follows (number of RSUs in thousands):
Vesting Date |  | Expected to Vest |  | Not Expected to Vest |  | Total
January 1, 2020 |  |  | 167 |  |  | - |  |  | 167
January 1, 2021 |  |  | 141 |  |  | - |  |  | 141
January 1, 2022 |  |  | 174 |  |  | - |  |  | 174
Phantom Stock Unit Activity Under the Phantom Stock Plan | Phantom stock unit activity under the phantom stock plan as of June 29, 2019 and changes during the six fiscal months then ended are presented below (number of phantom stock units in thousands):
|  | Number of units |  |  | Grant-date Fair Value per Unit |
Outstanding: |  |  |  |  |  |
January 1, 2019 |  |  | 170 |  |  |  |
Granted |  |  | 10 |  |  | $ | 17.72 |
Dividend equivalents issued |  |  | 2 |  |  |  |  |
Outstanding at June 29, 2019 |  |  | 182 |  |  |  |  |

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